Y37.7

⚠ Non-billable (Header)

Military operations involving chemical weapons and other forms of unconventional warfare

External causes of morbidity (V00-Y99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Check This Code

❌ Excludes1

direct

These codes are mutually exclusive. Never code them together.

• military operations involving incendiary devices (Y36.3-, Y36.5-)

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

Y37

• military aircraft involved in aircraft accident with civilian aircraft (V97.81-)
• military vehicles involved in transport accident with civilian vehicle (V09.01, V09.21, V19.81, V29.818, V39.81, V49.81, V59.81, V69.81, V79.81)
• military watercraft involved in water transport accident with civilian watercraft (V94.81-)
• war operations (Y36.-)

Child Codes (1)

Y37.7XMilitary operations involving chemical weapons and other forms of unconventional warfareHeader

Clinical Description

ICD-10-CM code Y37.7 represents military operations involving chemical weapons and other forms of unconventional warfare. This code falls under the External causes of morbidity (V00-Y99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 1 more specific child codes under Y37.7. Coders should note that Y37.7 has 5 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code Y37.7?

ICD-10-CM code Y37.7 is "Military operations involving chemical weapons and other forms of unconventional warfare". It belongs to the category: External causes of morbidity (V00-Y99).

Is Y37.7 a billable ICD-10 code?

No, Y37.7 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with Y37.7?

Y37.7 has 5 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in Y37

Other codes in the same category that may be relevant for differential coding:

Y37.0Military operations involving explosion of marine weapons Y37.1Military operations involving destruction of aircraft Y37.2Military operations involving other explosions and fragments Y37.3Military operations involving fires, conflagrations and hot substances Y37.4Military operations involving firearm discharge and other forms of conventional warfare Y37.5Military operations involving nuclear weapons Y37.6Military operations involving biological weapons Y37.9Other and unspecified military operations Y37.ABlast overpressure in military operations

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Code Information

CodeY37.7

BillableNo — Header code

ParentY37

CategoryExternal causes of morbidity (V00-Y99)

Excludes15 rule(s)

Excludes20 note(s)

Child codes1

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)